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Hybrid silicas/waterborne polyurethane composite properties: In situ formation vs. grafting methods

  • Original Paper: Nano-structured materials (particles, fibers, colloids, composites, etc.)
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Abstract

A series of composites of commercial waterborne polyurethane and hybrid silica were prepared by the sol–gel process through in situ synthesis. Mechanical properties, small angle X-ray scattering and differential scanning calorimetry measurements were performed to evaluate the effects that hybrid silica has on the properties of the resulting polyurethane composites. A series of 13 different organosilanes differing in polarity and alkyl chain length was studied. Under the present evaluated conditions, composites bearing hybrid silica were more likely to exhibit a reduction in mechanical resistance when compared to bare polyurethane. Samples also exhibited a negligible variation in glass transition temperature and a reduction in ΔCp. The enthalpy of the crystallization process exhibited an increase. Based on the small angle X-ray scattering measurements, the composites exhibited a small reduction in the interdomain spacing and an increase in the degree of phase separation.

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Acknowledgments

Heck thanks CNPq for the grant. The authors thank the LNLS (Project SAXS1-11797) for the measurements on the SAXS beamline (Project SAXS1-11797).

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Authors and Affiliations

  1. Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre, 91501-970, Brazil

    Cesar A. Heck & João Henrique Z. dos Santos

  2. Faculdade de Química, Universidade Luterana do Brasil, Av. Farroupilha, 8001, Canoas, 92425-900, Brazil

    Carlos R. Wolf

Authors
  1. Cesar A. Heck
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  2. João Henrique Z. dos Santos
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  3. Carlos R. Wolf
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Correspondence to João Henrique Z. dos Santos.

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Heck, C.A., dos Santos, J.H.Z. & Wolf, C.R. Hybrid silicas/waterborne polyurethane composite properties: In situ formation vs. grafting methods. J Sol-Gel Sci Technol 81, 505–513 (2017). https://doi.org/10.1007/s10971-016-4220-z

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  • DOI: https://doi.org/10.1007/s10971-016-4220-z

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